Tapered leaky wave ultrawide band microstrip antenna
First Claim
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1. An antenna comprising:
- a means for producing leaky wave radiation;
a means for tapering the leaky wave radiation;
said means for producing leaky wave radiation having a means for matching an input impedance of the antenna to a leaky wave mode of propagation;
said leaky wave radiation having a frequency range;
said means for producing leaky wave radiation also having a means for preventing and suppressing radiation caused by a plurality of surface mode excitations;
a microstrip having a plurality of layers; and
a plurality of patches located on the plurality of layers;
wherein the locations and widths of the plurality of patches on the plurality of layers are such that the input impedance of the antenna matches the leaky wave propagation mode of the radiation.
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Abstract
The present invention is a microstrip antenna which produces ultrawide band leaky wave radiation. The antenna produces leaky wave radiation, then trs the leaky wave radiation to produce an ultrawide bandwidth. The antenna includes tapered metal patches which taper the radiation. The antenna gives an ultrawide bandwidth performance of greater than a 4:1 ratio.
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Citations
14 Claims
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1. An antenna comprising:
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a means for producing leaky wave radiation; a means for tapering the leaky wave radiation; said means for producing leaky wave radiation having a means for matching an input impedance of the antenna to a leaky wave mode of propagation; said leaky wave radiation having a frequency range; said means for producing leaky wave radiation also having a means for preventing and suppressing radiation caused by a plurality of surface mode excitations; a microstrip having a plurality of layers; and a plurality of patches located on the plurality of layers; wherein the locations and widths of the plurality of patches on the plurality of layers are such that the input impedance of the antenna matches the leaky wave propagation mode of the radiation. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of producing a tapered ultra wide band traveling wave from a microstrip antenna comprising the steps of:
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producing leaky wave radiation tapering the leaky wave radiation; matching an input impedance of the antenna to a leaky wave mode of propagation; preventing and suppressing radiation caused by a plurality of surface mode excitations; forming said microstrip with a plurality of layers; locating a plurality of patches on said plurality of layers; positioning the locations and widths of the plurality of patches on the plurality of layers such that the input impedance of the antenna matches the leaky wave propagation mode of the radiation; and said leaky wave radiation having a frequency range expressed in the equation;
##EQU6## where said fc is the cutoff frequency of the leaky wave radiation and said ε
r is a dielectric constant of a substrate of the antenna.
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9. An article of manufacture comprising:
a tapered ultra wide band traveling wave formed by; producing leaky wave radiation with a means for producing leaky wave radiation; tapering the leaky wave radiation with a means for tapering the leaky wave radiation; a means for producing leaky wave radiation having a means for matching an input impedance of the antenna to a leaky wave mode of propagation; said leaky wave radiation having a frequency range; said means for producing leaky wave radiation also having a means for preventing and suppressing radiation caused by a plurality of surface mode excitations; a microstrip having a plurality of layers; a plurality of patches located on the plurality of layers; wherein the locations and widths of the plurality of patches on the plurality of layers are such that the input impedance of the antenna matches the leaky wave propagation mode of the radiation; and the frequency range of the leaky wave radiation expressed in the equation;
##EQU7## where fc is the cutoff frequency of the leaky mode and ε
r is the dielectric constant of the substrate of the antenna.
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10. An antenna comprising:
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a microstrip for producing leaky wave radiation, said microstrip having an upper layer and a lower layer; and a plurality of patches located on the upper and lower layers, where at least one of the patches is tapered for tapering the leaky wave radiation. - View Dependent Claims (11, 12, 13, 14)
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Specification